Fuel pump



Jan. 12, 1943.` A. M. BABlTcH Erm. 2,308,041

l FUEL PUMP v origial Filed July 3', 1959 2 sheets-sheet 1 Jan. l2,1943. 1 A. M. BABITCH Erm. 2,308,041

FUEL PUMP i Original Filed July 3, 1939 2 Sheets-Shet 2 ZmventorsPatented 12, `1943 FUEL PUMP Abraham M. Babiteh and Gordon W. Harry,Flint,

Mich., assignors to General Motors Corporal tion, Detroit, Mich., acorporationY of Delaware Original application July 3, 1939, Serial No.

282,707. Divided and this application September 27, 1941, Serial No.412,590

4 Claims. (Cl.

designated by numeral 55. This valve controls a This invention relatesto pumps and has been designed to improve the pumps which are used to4supply fuel for internal combustion engines.

An object of the invention is to provide an improved operatingmechanism.

Another object resides in an improved form ofV pulsator.

" Other objects'and advantages will be understood from the descriptionwhich follows:

This application is a division of our application for Fuel pump, SerialNo. 282,707, filed July 3,

1939 and patented-on December 16, 1941, as

Number 2,266,297. The earlier flied application is intended to obtaiprotection for the operating means. This ,application seeksy to obtainprotection for the pulsator.

In the drawings: i

' Figure 1 is a vertical section through one embodiment.

Figure 2 is a vertical section at right angles to that shown by Figure1.

Figure 3 is a top plan view partly broken away and in section.

Figure 4 is a vertical section through the upper part of the modifiedform.

Figure 5 is a vertical section through the upper part of anothermodiflcation.

Figure 6 is a. horizontal section through the modification shown inFigure 5.

Figure 7 is a vertical section of a modified form of operatingVmechanism.

In the form of invention shown by Figui- 1 to 3, numeral is usedtodesignatea housing. for the operating mechanism'. Numeral I3 is thebody member of the pump and l5 is a cap; Bolts |'1 secure these partstogether. The main diaphragm marked I9 is clamped between the housingandthe body I3. A second diaphragm 2| constituting a part of a; pulsatoris clamped between body I3 and cap '|5. Housing'll is closed by a cover23 secured by screws 25,

The body l3 at its top has a circular ledge 21 forming a space 29beneath diaphragm 2|. The

passage of fuel from a'source of supply to the fuel pump chamber 33. Asecond flange 51 is securedy to the body over the outlet passage 41. Ithouses an outlet valve 59. Just beyond valve 59, flange 51 is formedwith a passage 6| registering with a passage 53 in the body, passage B3opening into space 35. For supplying the float bowl of the carburetor,a'pipe, net shown, is to be connected to flange 51. The flanges 53 and51 aresecured by fastening means 55.

In the lower part of housing is a tubular extension 01 terminating in anattaching' flange 59. Rotatably mounted in the tubular extension is ashaft 1| having a projecting driving end 13. At V the other-end of thisshaft and within the housing is an eccentric pin 15. Rotatable on pin 15is 4the eye Il of a link 19. A second link 8| is rotatably associatedwith link 19 by a. connecting pin 83. Links 19 and 8| have arms 85 and81 respectively and a coil spring 89 is connected to these arms. Inpulling the arms together the spring brings into contact faces 9| and 93on the links and do so before the links reach alignment. A retaininglink 95 is pivoted to the housing at 91 and its other end is pivoted tolink 8| by pin 99. Pin 99 is also connectedto the lower forked end of astem |0|.` The stem has a neck |03 and a head |05. The head and the neckare proiected through a rectangular aperture of a plate |91. Thereafterthestem |0| isrotated about its axis through 90 degrees to lock the stemand plate l |01 from separation. This construction will be The pump maybe located in any position where.

driving' means is availablefor rotating shaft 1|. The eccentric pinoperates through the instrumentality of' links 19 and 8| and the stem|Il| to reciprocate the diaphragm. Fuel is drawn into body `I3 has alower circular ledge 3| forming a space 33 above the diaphragm I9. Asshown by Figure 3 the body |3- beneath the space 29 is formed into twoarcuate chambers 35 and 31 which are open to space 29. The two chambers35 and 31 are separated by a transverse partition. .This partitionincludes a circular dome 9 closed at its top and open to the space 33,an inlet passage 45 extending somewhat radially and a similar andslightly offset outlet passage 41.

A flange 53 seats against the body Aover .the inlet passage 45 and holdsin position an inlet valve the pump chamber through valve 55 in responseto the suction stroke of the pump and it is forcibly ejected throughvalve 59 by the discharge stroke.

IUniform discharge is-made possible by the pulsator, the pulsatorincluding chambers 35, 31 and 29 together with the diaphragm 2| backedby the air cushion between the diaphragm and the cap I5. Spring I9biases the linkage to that position where faces 9| and 93 are in contactwith the result that as long as this contact is made, full strokes botho! suction and discharge'occur. The discharge stroke may be resisted bybuilt up pressure at thel pump outlet due .to the closure valve in thecarburetor. When this outlet pressure is sufiicient to overcome spring89, the spring yields and a collapse of links 19 and 8| occurs. It willbe observed'that since the spring is connected only to the links and hasno contact with a fixed abutment its force is applied wholly to thediaphragmA |08 is preferably clamped between the circular 20 margins ofthe body member and member |04. In

I advance of the outlet valve |l0 the body is formed with a passage l2communicating with a passage ||4 in member |04 leading to the space'between the diaphragm |00 and the partition- |06, this space serving asa pulsator for the outlet valve. To provide a pulsator for the inletvalve there is a second diaphragm ||6 located between the' top of member|04 and a cap H8. 'I'he space between the partition |06 and thediaphragm ||S is in communication by suitable passages in the 4member|04 and the vbody member with that side of the inlet valve remote fromthe pump chamber. By this construction a pulsator elect is provided forboth the inlet and discharge of fuel.

The modification by which a double pulsator may be provided withbutasingle pulsator diaphragm is shown in Figures 5 and 6. In these figuresa body 20| and cap 203 clamp between them a diaphragm 205. The bodyandcap have transverse partitions 201 and 209 registering with eachother whereby two chambers 2| and 2 3 are formed. 'I'he chamber 2|3communicates by means of passages 2|5. and 2|`| in the body and thevalve carried 'ilange 2|0 with the region beyond the outlet valve.'Chamber 2|| is similarly associated with the space on the side of theinlet valve remote from thepump chamber. Suitable means 2| 0 secure tothem the cap and the body.

For some purposes the operating arrangement shown in Figure 7 may beused. Inthis form a stem 30| is connect-ed to a diaphragm, not shown,and corresponds with the stem |0| of Figure l. Links 305 and 301vconnected together at. 309

are terminally connected at 3|| to the stem 30| and to an eccentric` 3|3on a rotary shaft 3M.

l A guide link 3I5 is connectedto pin, 3|| and to a lil pin 3|'IVcarried by the housing. Link 301 has a specially formed surface 3|! toengage a pin 32| in link 305 and thereby prevents alignment ci thelinks. A spring 323 is hooked to' pin 309 and to a plug 320 adjustablyheld within 'a tubular member 325 threaded into the housing. A nut V326threaded on the plug andengaging the end of tubular member 325 providesadjustment for the.

spring. In this form of the invention the surface y3|0 of link 301normally engages the pin 32| of link 305 under the influence of thespring 32.3. This relation of links 305 and 301 prevails at all timesexcept when the outlet pressure of the pump overcomes the tension of thespring 323 at which times during the discharge, movement 4of theeccentric the linkage collapses.

We claim: l

1. A pump having a pump body formed with a pump chamber together withinlet and outlet valves, means forming a plurality of pulsator chambers,Asaid chambers being in communication with the sides of said`valvesremote from the pump chamber together with a single diaphragm closingsaid spulsator chambers and a recessed hollow cap secured to said pumpbody above said diaphragm to form therewith closedair spaces one aboveeach pulsator chamber.

2. A pump having a pump body -formed with a pump chamber together withinlet and outlet valves,A means forming a plurality of pulsatorchambers, said chambers being in communication with the sides of saidvalves remote from the pump chamber, said pump body having a partitionon its side remote from the pump chamber to separate said pulsatorchambers, a diaphragm closing said pulsator chambers and a cap having apartition to register with said iirst named partition and to form withsaid diaphragm an air sealed cushion above each pulsator chamber.

3. In a pump, a body, one side of saidbody forming a pump chamber wall,the other side of said body formed with a dividing partition to makepulsator chambers, a diaphragm over said body to close said pulsatorchambers, a cap secured to said body and means constituting apart ofsaid cap to form with said diaphragm closed p regions on the sides ofthe valves remote from the pump chamber.

4. The invention defined by claim 3, said means comprising a partitionregistering with said first named partition.

ABRAHAM M. BABITCH.

GORDON W. HARRY.

